p {
    /* color: blueviolet;
    font-style: italic;
    font-weight: lighter;
    font-size: 20px;
    font-family: "宋体";*/
    /*font: italic lighter 20px "宋体";*/
    font: 20px "宋体";
    color: #724848;
    text-indent: 2em;
    line-height: 30px;
    letter-spacing: 3px;
}

.red {
    color: red;
}

.black {
    color: black;
}

.big {
    font-size: larger;
}

h1 {
    text-align: center;
}

a {
    text-decoration: none;
    font-size: 25px;
    color: black;
}

a:visited {
    color: blueviolet;
}

a:hover {
    color: cornflowerblue;
    text-decoration: underline;
    font-style: italic;
    letter-spacing: 5px;
}